‘Nadir' is pronounced as ‘na-deer' with more stress on the first syllable.
‘Nadir' is a noun and singular.
Meaning: the worst moment of a particular situation.
1. The manager was caught in a money scam. The nadir of his job career has come.
2. In the times of recession, losses of the company reached their nadir.
3. The glorious days of the Indian hockey have gone long ago. The Indian hockey has now reached its nadir.